September
September · June · July
81climate match
United States · 1991–2020
Best time to visit
Gateway (historical).
September leads for comfortable weather in Gateway (historical): typically 23.5°C by day, 6.2°C at night, with 31 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.5°C
Typical low6.2°C
Rain in September31 mm
July
July · August · June
68climate match
May
May · September · June
83climate match
The weakest month is January, scoring 5 against September’s 81 — days reach only -0.1°C, 24° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
5-0.1° / -7.2°
Feb
53.3° / -6.4°
Mar
179.3° / -2.7°
Apr
4214.9° / 0.7°
May
6720.8° / 5.2°
Jun
7924.5° / 8.9°
Jul
7230.1° / 11.4°
Aug
7229.9° / 10.3°
Sep
8123.5° / 6.2°
Oct
3813.9° / 1.2°
Nov
55° / -2.7°
Dec
5-0.4° / -6.5°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -0.1°C | -7.2°C | 23 mm | 6.5 | 8 h 39 | 5 | Strong coverage |
| February | 3.3°C | -6.4°C | 19 mm | 4.9 | 10 h 04 | 5 | Strong coverage |
| March | 9.3°C | -2.7°C | 22 mm | 5.8 | 11 h 43 | 17 | Strong coverage |
| April | 14.9°C | 0.7°C | 26 mm | 5.6 | 13 h 38 | 42 | Strong coverage |
| May | 20.8°C | 5.2°C | 45 mm | 7.2 | 15 h 15 | 67 | Strong coverage |
| June | 24.5°C | 8.9°C | 62 mm | 8.2 | 16 h 10 | 79 | Strong coverage |
| July | 30.1°C | 11.4°C | 29 mm | 4.7 | 15 h 48 | 72 | Strong coverage |
| August | 29.9°C | 10.3°C | 24 mm | 3.7 | 14 h 23 | 72 | Strong coverage |
| September | 23.5°C | 6.2°C | 31 mm | 5 | 12 h 32 | 81 | Strong coverage |
| October | 13.9°C | 1.2°C | 32 mm | 6.9 | 10 h 42 | 38 | Strong coverage |
| November | 5°C | -2.7°C | 31 mm | 7.1 | 9 h 04 | 5 | Strong coverage |
| December | -0.4°C | -6.5°C | 29 mm | 7.1 | 8 h 15 | 5 | Strong coverage |
What has changed
Gateway (historical) runs +1.2°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+2.7
Feb
-1.2
Mar
+1.4
Apr
+0.4
May
+1.5
Jun
+1.0
Jul
+2.0
Aug
+1.5
Sep
+1.8
Oct
+0.4
Nov
+0.9
Dec
+1.7
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.2°C24 Jan 2005 | -37.2°C11 Jan 1963 | 18 mm24 Jan 1981 | 70 mm1969 · driest 3 mm in 1985 | 65 |
| February | 18.9°C24 Feb 1995 | -34.4°C2 Feb 1996 | 22 mm6 Feb 2017 | 85 mm2017 · driest 1 mm in 2010 | 65 |
| March | 25.6°C30 Mar 2004 | -30.6°C3 Mar 2019 | 19 mm16 Mar 2015 | 58 mm2012 · driest 2 mm in 1973 | 64 |
| April | 31.7°C28 Apr 1987 | -13.3°C1 Apr 1975 | 26 mm24 Apr 1998 | 66 mm2011 · driest 3 mm in 1970 | 64 |
| May | 34.4°C23 May 2001 | -5.6°C14 May 2008 | 38 mm22 May 2002 | 141 mm1998 · driest 9 mm in 2001 | 64 |
| June | 41.1°C30 Jun 2021 | -2.8°C11 Jun 1973 | 43 mm20 Jun 2013 | 149 mm2012 · driest 11 mm in 1960 | 65 |
| July | 40.6°C24 Jul 2006 | -1.1°C3 Jul 1962 | 33 mm22 Jul 1987 | 118 mm1993 · driest 0 mm in 2021 | 65 |
| August | 41.1°C10 Aug 2018 | -1.1°C29 Aug 1969 | 46 mm30 Aug 2023 | 112 mm1989 · driest 0 mm in 1969 | 64 |
| September | 36.7°C1 Sep 1967 | -7.8°C28 Sep 1985 | 48 mm9 Sep 2019 | 102 mm1985 · driest 0 mm in 1990 | 65 |
| October | 30.0°C7 Oct 1980 | -17.8°C30 Oct 2002 | 26 mm2 Oct 2018 | 115 mm2016 · driest 2 mm in 1974 | 63 |
| November | 20.0°C12 Nov 1999 | -30.6°C28 Nov 1985 | 29 mm12 Nov 1989 | 68 mm1966 · driest 2 mm in 1969 | 65 |
| December | 15.0°C1 Dec 2021 | -45.6°C30 Dec 1968 | 37 mm9 Dec 2015 | 92 mm1964 · driest 5 mm in 1997 | 64 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | <1 | 6 |
| February | 0 | 0 | 25 | <1 | 4 |
| March | 0 | 0 | 22 | <1 | 3 |
| April | 1 | 0 | 14 | <1 | <1 |
| May | 8 | 2 | 4 | 1 | <1 |
| June | 14 | 5 | <1 | 2 | 0 |
| July | 26 | 18 | 0 | <1 | 0 |
| August | 27 | 17 | 0 | <1 | 0 |
| September | 13 | 4 | 2 | <1 | 0 |
| October | <1 | 0 | 13 | <1 | <1 |
| November | 0 | 0 | 20 | <1 | 2 |
| December | 0 | 0 | 27 | <1 | 6 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 82); on 2011–2025 it is September (85). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 22% | 1% | 21% | -4.6–2.7°C |
| February | 0% | 18% | 1% | 18% | -0.1–6.5°C |
| March | 2% | 17% | <1% | 16% | 6.3–12.2°C |
| April | 18% | 17% | 2% | 14% | 12.3–17.8°C |
| May | 46% | 24% | 3% | 27% | 17.7–22.8°C |
| June | 66% | 26% | 5% | 29% | 22.2–27.4°C |
| July | 83% | 16% | 3% | 13% | 27.5–33.4°C |
| August | 84% | 14% | 2% | 13% | 26.1–31.6°C |
| September | 62% | 17% | 2% | 16% | 19.0–27.0°C |
| October | 16% | 20% | 1% | 20% | 11.1–16.6°C |
| November | 0% | 24% | 2% | 27% | 2.0–7.1°C |
| December | 0% | 24% | 1% | 24% | -4.0–2.7°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5653884
- NOAA station
- USC00242827 · EUREKA RS
- Station distance
- 13.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 49.00°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.